GENERATION OF RADIATION ON MULTIPLE FREQUENCIES IN GAZES AT PLASMA EXCITATION BY A STRONG FIELD OF FEW-CYCLE PULSES
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High-frequency radiation generation at neon optical breakdown by femtosecond few-cycle pulses is considered. It is shown that as the number of oscillations per pulse decreases up to just one, a shift of multiple harmonics to shorter wavelengths grows. The plasma dielectric nonlinearity leads to amplified redistribution of radiation energy to shorter wavelengths.